A pair of fancy intense yellow diamonds steeped in history and weighing 82.47 carats and 102.54 carats, respectively, is expected to fetch up to $13.7 million at Sotheby's Geneva next month. "The Donnersmarck Diamonds" were famously owned by La Païva, a Russian-born courtesan who ascended into French high society in the mid-1800s, eventually marrying Count […]